1215400530 has 32 divisors (see below), whose sum is σ = 2921421888. Its totient is φ = 323611200.

The previous prime is 1215400519. The next prime is 1215400553. The reversal of 1215400530 is 350045121.

It is a super-3 number, since 3×1215400530³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1215400497 and 1215400506.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10816 + ... + 50475.

It is an arithmetic number, because the mean of its divisors is an integer number (91294434).

Almost surely, 2^1215400530 is an apocalyptic number.

1215400530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1215400530 is an abundant number, since it is smaller than the sum of its proper divisors (1706021358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1215400530 is a wasteful number, since it uses less digits than its factorization.

1215400530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61962.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 1215400530 is about 34862.5949980778. The cubic root of 1215400530 is about 1067.1852329896.

Adding to 1215400530 its reverse (350045121), we get a palindrome (1565445651).

The spelling of 1215400530 in words is "one billion, two hundred fifteen million, four hundred thousand, five hundred thirty".